function enableTooltips(id) {
	var links, i, h ,tds;
	if (!document.getElementById || !document.getElementsByTagName)
		return;
	AddCss();
	h = document.createElement("span");
	h.id = "btc";
	h.setAttribute("id", "btc");
	h.style.position = "absolute";
	document.getElementsByTagName("body")[0].appendChild(h);
	if (id == null){
		links = document.getElementsByTagName("a");
		tds = document.getElementsByName("showTip");
	}
	else{
		var obj = document.getElementById(id);
		links = obj.getElementsByTagName("a");
	}	
	
	
	for (i = 0; i < links.length; i++) {
		Prepare(links[i]);
	}
}

function Prepare(el) {
	var tooltip, t, b, s, l;
	t = el.getAttribute("title");
	if (t == null || t.length == 0)
		return;// 如果没有写title属性则不加入提示.
		// t="link:"; //如果没有title则设置title是"link:"
	el.removeAttribute("title");
	tooltip = CreateEl("span", "tooltip");
	s = CreateEl("span", "top");
	s.appendChild(document.createTextNode(t));
	tooltip.appendChild(s);
	b = CreateEl("b", "bottom");
	/*
	 * 默认添加超级链接的href属性提示上 l=el.getAttribute("href"); if(l.length>30)
	 * l=l.substr(0,27)+"..."; b.appendChild(document.createTextNode(l));
	 */
	tooltip.appendChild(b);
	setOpacity(tooltip);
	el.tooltip = tooltip;
	el.onmouseover = showTooltip;
	el.onmouseout = hideTooltip;
	el.onmousemove = Locate;
}

function showTooltip(e) {
	document.getElementById("btc").appendChild(this.tooltip);
	Locate(e);
}

function hideTooltip(e) {
	var d = document.getElementById("btc");
	if (d.childNodes.length > 0)
		d.removeChild(d.firstChild);
}

function setOpacity(el) {
	el.style.filter = "alpha(opacity:95)";
	el.style.KHTMLOpacity = "0.95";
	el.style.MozOpacity = "0.95";
	el.style.opacity = "0.95";
}

function CreateEl(t, c) {
	var x = document.createElement(t);
	x.className = c;
	x.style.display = "block";
	return (x);
}

function AddCss() {
	var l = CreateEl("link");
	l.setAttribute("type", "text/css");
	l.setAttribute("rel", "stylesheet");
	l.setAttribute("href", "?.css");
	l.setAttribute("media", "screen");
	document.getElementsByTagName("head")[0].appendChild(l);
}

function Locate(e) {
	var posx = 0, posy = 0;
	if (e == null)
		e = window.event;
	if (e.pageX || e.pageY) {
		posx = e.pageX;
		posy = e.pageY;
	} else if (e.clientX || e.clientY) {
		if (document.documentElement.scrollTop) {
			posx = e.clientX + document.documentElement.scrollLeft;
			posy = e.clientY + document.documentElement.scrollTop;
		} else {
			posx = e.clientX + document.body.scrollLeft;
			posy = e.clientY + document.body.scrollTop;
		}
	}
	document.getElementById("btc").style.top = (posy + 20) + "px";
	document.getElementById("btc").style.left = (posx + 10) + "px";
}